Unlock instant, AI-driven research and patent intelligence for your innovation.

Semiconductor device, movement and electronic watch

a technology of electromagnetic waves and electromagnetic waves, applied in the direction of pulse techniques, instruments, horology, etc., can solve the problem of inability to achieve proper oscillation

Active Publication Date: 2020-11-03
SEIKO EPSON CORP
View PDF17 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent text describes an oscillator circuit and control circuit that can adjust the frequency of oscillation to a desired value. The circuit includes a DC cut capacitor, an inverter, and two feedback resistors. The control circuit can short-circuit the feedback resistors at startup and open them after a predetermined time has passed. This allows for a smooth transition of the oscillator circuit during startup. The technical effect of this patent is to provide a more efficient and effective way to control the frequency of oscillation in an oscillator circuit.

Problems solved by technology

However, in the oscillating circuit of JP-A-2004-96711, in addition to the oscillation caused by the crystal oscillator, a closed loop self-oscillation is generated by the oscillating inverter and the first feedback resistor, thus there is a problem that proper oscillation cannot be achieved.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Semiconductor device, movement and electronic watch
  • Semiconductor device, movement and electronic watch
  • Semiconductor device, movement and electronic watch

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0039]As illustrated in FIG. 1, an electronic watch 1 is a watch mounted on a wrist of a user, and includes an outer case 2, an dial 3 having a disk shape, a seconds hand 5, a minute hand 6, an hour hand 7, which are hands driven by a movement (not illustrated), and a crown 8 which is an operation member. Note that, a date display and the seconds hand 5 are not required, and the electronic watch 1 may not include the seconds hand 5 or the date display member such as a date indicator, a day indicator and the like.

[0040]The movement of the electronic watch 1 includes a semiconductor device 10 constituted by CMOS-IC or the like. As illustrated in FIG. 2, the semiconductor device 10 includes an oscillating circuit 20, a frequency dividing circuit 11 for high frequency, a frequency dividing circuit 12 for low frequency, a driving circuit 13, a constant voltage circuit 14, and a control circuit 15. The driving circuit 13 is a circuit configured to drive a stepping motor 16, and the steppi...

second embodiment

[0068]Next, Second Embodiment of the present disclosure will be described with reference to FIGS. 6 to 8. Note that, in Second Embodiment, the same or similar components as or to those of First Embodiment will be given the same reference numerals and detailed description will be omitted or simplified.

[0069]As illustrated in FIGS. 6 and 7, the oscillating circuit 20B of Second Embodiment is different from the oscillating circuit 20 of First Embodiment in that a first switch 51, a second switch 52, a third switch 53, and a fourth switch 54 are provided. The rest of the configuration of the oscillating circuit 20B is the same as those of the oscillating circuit 20, and thus the description of them is omitted.

[0070]Similar to the switch 50 of First Embodiment, the first switch 51 is coupled in parallel to the DC cut capacitor 27. Specifically, the first switch 51 is disposed on a signal line coupling the input side of the second feedback resistor 26 and the output side of the DC cut cap...

third embodiment

[0084]Next, Third Embodiment of the present disclosure will be described with reference to FIGS. 9 to 11. Note that, in Third Embodiment, the same or similar components as or to those of Second Embodiment will be given the same reference numerals and detailed description will be omitted or simplified.

[0085]As illustrated in FIGS. 9 and 10, an oscillating circuit 20C according to Third Embodiment is different from the oscillating circuit 20B according to Second Embodiment in that a variable resistor is used as a second feedback resistor 26C, that the third switch 53 is used to switch the resistance value of the second feedback resistor 26C, and that the oscillating circuit 20C does not include the fourth switch 54. The rest of the configuration of the oscillating circuit 20C is the same as those of the oscillating circuit 20B, and thus the description of them is omitted.

[0086]The first switch 51 and the second switch 52 are the same as those of Second Embodiment, thus the description...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An oscillating circuit includes an input terminal and an output terminal, to both of which an oscillator is coupled, a DC cut capacitor having one terminal of two terminals that is coupled to the input terminal, an inverter having an input side coupled to the other terminal of the DC cut capacitor and an output side coupled to the output terminal, a first feedback resistor coupled in parallel to the inverter, a second feedback resistor coupled in parallel to the DC cut capacitor and the inverter, and a switch coupled in parallel to the DC cut capacitor.

Description

[0001]The present application is based on, and claims priority from JP Application Serial Number 2018-161123, filed Aug. 30, 2018, the disclosure of which is hereby incorporated by reference herein in its entirety.BACKGROUND1. Technical Field[0002]The present disclosure relates to a semiconductor device, a movement, and an electronic watch.2. Related Art[0003]An oscillating circuit illustrated in FIG. 3 of JP-A-2004-96711 is known as an oscillating circuit that can stably oscillate an oscillator such as a crystal oscillator, and has little fluctuation in oscillation frequency. The oscillating circuit is configured to include an oscillating inverter coupled to the oscillator via a signal path, and a first feedback resistor coupled to an input / output side of the oscillating inverter. In addition, a direct current (DC) cut capacitor is disposed for anti-oscillation suppression by a leak generated at the input terminal of the oscillator. When the DC cut capacitor is disposed on the inpu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): H03K3/282H03B5/12G04G3/02
CPCH03B5/1228G04G3/02H03B5/364G04G19/00G04C3/143H03B5/06H03B2200/0094
Inventor NINOMIYA, MASAYA
Owner SEIKO EPSON CORP